Title:
Terrain obstacle detector
United States Patent 2951248
US Patent References:
Phase comparator
- - 2467361

Signal comparison system
- - 2509207


Inventors:
Goodell, Everett M.
Publication Date:
08/30/1960
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Assignee:
RAMO WOOLDRIDGE CORP
Primary Class:
342/442
Other Classes:
367/909, 367/125, 367/111
International Classes:
G01S13/94; G01S13/00